Three stainless-steel heads in package needed for each change on razor

Blades shave in two stages: slots for long hairs, holes for short hairs

Simple installation

Combined, heads designed to adjust to individual facial contours

Amazon.com ReviewThese three stainless-steel heads fit Norelco Quadra Action razors only. Blades in the heads shave in two stages, with slots for long hairs and holes for short hairs. Installing them is simple, and the package provides illustrated instructions. They adjust to individual facial contours for a smooth, effortless shave. --Fred Brack